The practical application of ACIM's teachings can be a point of contention. While some individuals report good transformations and particular growth from after the course, others find the techniques to be useless as well as harmful. The course's emphasis on forgiveness and love is excellent, but experts argue that it can be overly basic and naïve, declining to handle the complexities of human associations and the need for limits and accountability. Additionally, the course's size and extensive character can be overwhelming for some people, ultimately causing burnout or disillusionment. Authorities suggest that the time and work needed to perform ACIM might be greater spent on more empirically reinforced therapeutic practices or religious disciplines which have a proven history of effectiveness.

The broader impact of ACIM on the spiritual and self-help communities is also worth considering. The program has influenced an important following and has been incorporated into various New Age and religious movements. Nevertheless, their impact is visible as a double-edged sword. Using one give, it's presented a structure for persons seeking spiritual development a course in miracles  and inner peace. On the other give, their teachings can contribute to a tradition of spiritual bypassing, where individuals use spiritual ideas to prevent coping with personal and cultural issues. This could lead to a form of escapism, where the give attention to spiritual values distracts from the necessity of interesting with and approaching real-world challenges.

Moreover, the industrial achievement of ACIM and their related products increases ethical concerns. The expansion of workshops, books, and seminars based on ACIM is seen as capitalizing on individuals' religious needs and vulnerabilities. Authorities disagree that the commercialization of spirituality may result in the exploitation of seekers, who may possibly spend substantial time and income in to methods that finally don't produce on their promises. This commercialization can also donate to the dilution of the course's teachings, as various interpretations and adaptations proliferate, potentially ultimately causing distress and misapplication of the principles.

Yet another critical aspect to consider could be the exclusivity and dogmatism that can sometimes accompany the ACIM community. Whilst the class it self stimulates common enjoy and forgiveness, the way it's taught and practiced by some adherents may cause a sense of spiritual elitism. This may create an "us versus them" mindset, wherever people who follow ACIM are regarded as enlightened, while those that do not are seen as misguided or unenlightened. Such attitudes can be divisive and counterproductive to the course's purported objectives of peace and unity. Experts disagree that true spiritual growth should foster inclusivity and humility, rather than making a hierarchical variance between the spiritually awakened and the unawakened.